Version history

abcg::Application::run now takes by value a unique pointer to abcg::OpenGLWindow. Since std::unique_ptr cannot be copied, the caller must either use std::move or pass the pointer as an rvalue. This makes clear the intent of transferring ownership of the pointer, which was not explicit in the previous version that takes an lvalue reference.
Support for running multiple windows has been dropped. Multiple windows weren't working properly on Emscripten builds and aren't used in the course.
abcg::opengl::loadCubemap now transforms the cube map textures to a right-handed coordinate system by default. A small loading overhead is incurred because some of the bitmaps are flipped vertically and horizontally. This behavior can be disabled by setting the (new) parameter rightHandedSystem to false.

Fixed flickering effect when glClear is not called for each frame. For this fix to work, abcg::OpenGLSettings::preserveWebGLDrawingBuffer must be true even when building for desktop.

abcg::Exception::OpenGL now generates a string describing all OpenGL error messages returned by glGetError when there are multiple errors.
All OpenGL functions from OpenGL ES 2.0 and ES 3.0 can now be qualified with the abcg namespace (e.g. abcg::glActiveTexture(0)) for automatic error handling in debug builds. This is an alternative to the GL_CHECK macro used in many engines to check for errors before and after each GL call.
Updated external libraries (Dear ImGui v1.84; cppitertools v2.1; {fmt} 8.0.1).

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